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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Principal | $ 1,443 | $ 1,318
Discount and Issue Costs | (20) | (16)
Carrying Value | 1,423 | 1,302
Senior Notes | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 1,018 | 1,018
Discount and Issue Costs | (6) | (6)
Carrying Value | 1,012 | 1,012
Senior Notes | 4.50% Senior Notes due June 2047 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 590 | 590
Discount and Issue Costs | (2) | (2)
Carrying Value | 588 | 588
Senior Notes | 3.50% Senior Notes due August 2026 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 425 | 425
Discount and Issue Costs | (4) | (4)
Carrying Value | 421 | 421
Senior Notes | Other | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 3 | 3
Discount and Issue Costs | 0 | 0
Carrying Value | 3 | 3
Subordinated Debentures | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 425 | 300
Discount and Issue Costs | (14) | (10)
Carrying Value | 411 | 290
Subordinated Debentures | 6-1/4% Subordinated Debentures due September 2054 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 150 | 150
Discount and Issue Costs | (5) | (5)
Carrying Value | 145 | 145
Subordinated Debentures | 6% Subordinated Debentures due November 2055 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 150 | 150
Discount and Issue Costs | (5) | (5)
Carrying Value | 145 | 145
Subordinated Debentures | 5.875% Subordinated Debentures due in March 2059 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 125 | 0
Discount and Issue Costs | (4) | 0
Carrying Value | $ 121 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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